Hung Dau Sa
紅豆沙·(hoong-dow-sah)
Tong Sui for the Soul: The Rhythms of Dessert
There is a beautiful, unapologetic rhythm to the end of a Cantonese meal. It doesn't conclude with heavy pastries, but with tong sui—sugar water. Hung Dau Sa is the undisputed soul of this tradition, a comforting, sandy suspension of red beans and aged tangerine peel. The secret to a grandmother's canonical bowl isn't a modern immersion blender, but the physical breakdown of the bean to create a velvety texture known as 'qi sha.' By employing a brilliant freezer hack the night before, a home cook can coax out that uncompromising texture on a Tuesday night without standing over a simmering pot for three hours.
Before you start
Soak the rinsed red beans in warm water for two to three hours until plump.
Drain the beans, leaving them slightly wet, and freeze them in a plastic container overnight.
As the residual water turns to ice, it expands, fracturing the beans' tough cellular structure from the inside out so they cook in a fraction of the traditional time.
Soak the dried tangerine peel in warm water for 20 minutes until pliable, then gently scrape away the white pith with a dull knife.
Unless you have paid a premium for decades-old peel, that white pith will release a bitter compound called rutin into the soup. Do not skip this step.
Ingredients
- dried small red beans1 1/2 cup
- aged tangerine peel1 small piece
- water8 cup
- Chinese rock sugar2 1/2 oz
- brown slab sugar2 1/2 oz
- kosher salt1 pinch
Method
- 01
Bring the water to a rolling boil in a heavy-bottomed pot or Dutch oven.
Drop the solid block of frozen beans and the scraped tangerine peel directly into the boiling water. The extreme thermal shock causes the structurally weakened beans to burst almost immediately.
- 02
Reduce the heat to medium-low, crack the lid, and simmer vigorously for 45 to 60 minutes.
Check occasionally and add a splash of boiling water if the liquid reduces too much. The beans should become completely soft and begin to split open.
- 03
Crush half the beans against the side of the pot using a ladle or potato masher.
This traditional mechanical mashing, known as 'chai sha,' releases the starchy interior into the broth, instantly transforming it into a thick, sandy suspension while leaving the delicate bean skins intact.
- 04
Stir in the sugars and salt only after the beans have completely broken down.
Adding sugar earlier acts as an osmotic barrier, hardening the beans and preventing them from ever softening properly. Simmer for a final 15 to 20 minutes to dissolve the sugars and meld the flavors, then let sit for 10 minutes off the heat before serving.
Notes
The Instant Pot workaround.
If you forgot to freeze the beans the night before, pressure cook the unsoaked beans, peel, and 6 cups of water on High Pressure for 40 minutes, followed by a natural release. Mash the beans, switch to the sauté setting, and dissolve the sugar.
Brown sugar substitution.
If you cannot find traditional brown slab sugar (pian tang) at your local Asian market, substitute it with a half cup of lightly packed light brown sugar to mimic those molasses notes.